
1.Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, China
2.Jiangsu Bree Optronics Co., Ltd, Nanjing 211103, China
3.Department of Physics, Georgia Southern University, Statesboro, GA 30460, USA
Yanjie Liang (yanjie.liang@sdu.edu.cn)
Xiao-Jun Wang (xwang@georgiasouthern.edu)
Published:30 June 2022,
Published Online:13 May 2022,
Received:06 January 2022,
Revised:16 April 2022,
Accepted:25 April 2022
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Zhang, Y. et al. Blue LED-pumped intense short-wave infrared luminescence based on Cr3+-Yb3+-co-doped phosphors. Light: Science & Applications, 11, 1194-1205 (2022).
Zhang, Y. et al. Blue LED-pumped intense short-wave infrared luminescence based on Cr3+-Yb3+-co-doped phosphors. Light: Science & Applications, 11, 1194-1205 (2022). DOI: 10.1038/s41377-022-00816-6.
The growing demand for spectroscopy applications in the areas of agriculture
retail and healthcare has led to extensive research on infrared light sources. The ability of phosphors to absorb blue light from commercial LED and convert the excitation energy into long-wavelength infrared luminescence is crucial for the design of cost-effective and high-performance phosphor-converted infrared LEDs. However
the lack of ideal blue-pumped short-wave infrared (SWIR) phosphors with an emission peak longer than 900 nm greatly limits the development of SWIR LEDs using light converter technology. Here we have developed a series of SWIR-emitting materials with high luminescence efficiency and excellent thermal stability by co-doping Cr
3+
-Yb
3+
ion pairs into Lu
0.2
Sc
0.8
BO
3
host materials. Benefitting from strong light absorption of Cr
3+
in the blue waveband and very efficient Cr
3+
→Yb
3+
energy transfer
the as-synthesized Lu
0.2
Sc
0.8
BO
3
: Cr
3+
Yb
3+
phosphor emits intense SWIR light in the 900–1200 nm from Yb
3+
under excitation with blue light at ~460 nm. The optimized phosphor presents an internal quantum yield of 73.6% and the SWIR luminescence intensity at 100 ℃ can still keep 88.4% of the starting value at 25 ℃. SWIR LED prototype device based on Lu
0.2
Sc
0.8
BO
3
: Cr
3+
Yb
3+
phosphor exhibits exceptional luminescence performance
delivering SWIR radiant power of 18.4 mW with 9.3% of blue-to-SWIR power conversion efficiency and 5.0% of electricity-to-SWIR light energy conversion efficiency at 120 mA driving current. Moreover
under the illumination of high-power SWIR LED
covert information identification and night vision lighting have been realized
demonstrating a very bright prospect for practical applications.
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